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My spectrum of last night and the evolution since the 9th august with 4 spectra




H alpha and H beta velocity evolutions





And the evolution of Iron line at 5753 Å

Rainer Ehlert wrote:Hi,

I guess comparing images with different exposure times is not a good idea, or ? August 10 I used 60 seconds and August 12 I used 120 seconds.

Hi Rainer,

Comparing different exposures is not a problem. In fact it is a good idea to increase the total exposure time as it fades so the SNR is maintained. Just scale them to 1 at the same wavelength. Or even calibrate them in absolute flux, for example using V magnitude values so you can compare the line strengths directly, as described in the document "A method of calibrating spectra in absolute flux using V magnitudes" by David Boyd on the BAA spectroscopy resources page
https://britastro.org/node/19378

Cheers
Robin

Olivier,

Je ne pense pas que la raie soit [Fe II] 5753.
C'est [NII] 5755 (FWHM = 47 km/s) - pas de composant large comme pour beaucoup d'autres raies: HI, He I, Fe II - et qui se forme dans la nébuleuse symbiotique formée par le vent stellaire de la géante rouge et qui existe avant l'explosion nova.


François

What to expect and why:
RS Oph and Symbiotic-like recurrent novae

A comprehensive text by Steve Shore to understand the event and the formation/evolution of the speactra that we obtain.
http://www.astrosurf.com/aras/novae/Inf ... etter.html

François

There will be an online conference on the current Nova RS Oph on Saturday 4th September at 18H UTC. (6 pm UT)
The program :

- The recurrent symbiotic novae in the context of the 2021 eruption of RS Oph (30 mn) by François Teyssier

- RS Ophuchi -- an ordinary nova under extraordinary circumstances (30 mn) by Steve Shore

- Discussion with Steve Shore (30 mn)

Meeting is in english only

To register, please write your email address on the following link (not your name) to receive the zoom link one day before the meeting.
https://framadate.org/DYetsjBRgzL1Zq65

Places limited to the first 100 participants.

Recommended lecture: http://www.astrosurf.com/aras/novae/Inf ... 20-04a.pdf

Hello all,

Here is my new update for the monitoring of the outburst of RS Oph with two new spectra obtained with my Alpy 600.
The first one, the 14th of August at 21 h 06 TU (resolution of 521, JJ = 2459441.3793) and an acquisition time of 15 min s (60 x 15 s) : The second one, the 15th of August at 21 h 15 TU (resolution of 535, JJ = 2459442.3853) and an acquisition time of 7 min s (14 x 30 s) : The relative intensities of the Balmer lines have increased significantly as well as those of HeI : Overall, the relative intensities of the FeII lines seem to have changed very little.
The larger increase in the relative intensity of some FeII lines seems to be due to the presence of HeI lines blended with them (e.g. at 4923 and 5018 A) : Clear skies to all !!

Christophe BOUSSIN

Hi,

Yesterday I was able to shot another series of RS Oph. Below the comparison of August 10, 12 and 15.

Hello,

You can see here more evolution details.

J.G.

The big advantage of a small telescope for observation of relative bright object -> the high spectral resolution. Here Star'Ex 2400 lines/mm grating, 19 microns slit on D=65mm f/6.5 refractor (TS) at R=24000 (one hour observation), 16.80/08/2021 :



After elimination of H2O telluric lines (a parasitic signal, equivalent to a flat-field error) - the true H-alpha profile of RS Ohp for the date:



The setup used (in parallel to a 8-inch Newton telescope):





Christian Buil

Tout se passe comme prévu

Comparaison des courbes de luminosité des outbursts de 2008 et 2021: